U.S. patent number 10,798,794 [Application Number 16/188,344] was granted by the patent office on 2020-10-06 for led lighting assembly and drive circuit.
This patent grant is currently assigned to CURRENT LIGHTING SOLUTIONS, LLC. The grantee listed for this patent is Current Lighting Solutions, LLC. Invention is credited to Junxian Chu, Dengfeng He, Junhua Huang, Zhichao Liu, Dazhen Wang, Qiang Zou.
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United States Patent |
10,798,794 |
Wang , et al. |
October 6, 2020 |
LED lighting assembly and drive circuit
Abstract
The present invention discloses an LED lighting assembly
configured to retrofit a fluorescent tube, comprising at least one
LED, and a driving circuit configured to drive the at least one
LED. The driving circuit comprises a switch control module and a
rectifying circuit. The driving circuit is connected to the at
least one LED and configured to receive and process an AC voltage
signal from one side or both sides of the LED lighting assembly,
and control the driving of the at least one LED based on the
processed voltage signal. The rectifying circuit is connected to
the at least one LED and configured to convert an AC power inputted
to the rectifying circuit into a DC power supplied to the at least
one LED. The present invention also discloses an LED driving
circuit configured to retrofit a fluorescent tube.
Inventors: |
Wang; Dazhen (Xian,
CN), He; Dengfeng (Xian, CN), Zou;
Qiang (Xian, CN), Liu; Zhichao (Shanghai,
CN), Huang; Junhua (Shanghai, CN), Chu;
Junxian (Xian, CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Current Lighting Solutions, LLC |
East Cleveland |
OH |
US |
|
|
Assignee: |
CURRENT LIGHTING SOLUTIONS, LLC
(East Cleveland, OH)
|
Family
ID: |
1000005100274 |
Appl.
No.: |
16/188,344 |
Filed: |
November 13, 2018 |
Prior Publication Data
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|
|
|
Document
Identifier |
Publication Date |
|
US 20190200426 A1 |
Jun 27, 2019 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F21K
9/278 (20160801); H05B 45/10 (20200101); H05B
45/37 (20200101); H05B 45/40 (20200101); H05B
45/00 (20200101) |
Current International
Class: |
H05B
45/00 (20200101); H05B 45/37 (20200101); F21K
9/278 (20160101); H05B 45/10 (20200101); H05B
45/40 (20200101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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|
|
2014115010 |
|
Dec 2013 |
|
WO |
|
2016112538 |
|
Jul 2015 |
|
WO |
|
Primary Examiner: Vu; Jimmy T
Attorney, Agent or Firm: Buckley, Maschoff & Talwalkar
LLC
Claims
The invention claimed is:
1. A LED lighting assembly configured to retrofit a fluorescent
tube, comprising: at least one LED; and a driving circuit
configured to drive the at least one LED, comprising: a switch
control module connected to the at least one LED and configured to
receive and process an alternating current voltage signal from one
side or two sides of the LED lighting assembly and control to drive
the at least one LED based on a processed voltage signal; a first
impedance element disposed between first and second lamp pins on a
first side of the LED lighting assembly; a second impedance element
disposed between third and fourth lamp pins on a second side of the
LED lighting assembly; a first rectifying circuit connected to the
at least one LED and configured to convert a first alternating
current power received from the first impedance element into a
first direct current power provided to the at least one LED; and a
second rectifying circuit connected to the at least one LED and
configured to convert a second alternating current power received
from the second impedance element into a second direct current
power provided to the at least one LED.
2. An LED lighting assembly configured to retrofit a fluorescent
tube lamp, comprising: at least one LED; and a driving circuit
configured to drive at least one LED, comprising: a switch control
module connected to the at least one LED and configured to receive
and process an alternating current voltage signal form one side or
two sides of the LED lighting assembly and control to drive the at
least one LED based on a processed voltage signal, wherein the
switch control module further comprises: at least one impedance
element configured to receive the alternating current voltage
signal and generate a pre-processed voltage signal; a switch
element having a first threshold and connected to the at least one
impedance element; and at least one integral element connected in
parallel with the switch element, configured to integrating the
pre-process voltage signal and provide the processed voltage signal
to the switch element; wherein the switch element switches on and
the control switch module drives the at least one LED when the
processed voltage signal is larger than the first threshold; and a
rectifying circuit connected to the at least one LED configured to
convert an alternating current power inputted to the rectifying
circuit into a direct current power provided to the at least one
LED.
3. The LED lighting assembly according to claim 2, wherein the at
least one impedance element comprises a resistance configured to
reduce a voltage of the alternating current voltage signal and
generate a reduced voltage signal, and the pre-processed voltage
signal is the reduced voltage signal.
4. The LED lighting assembly according to claim 2, wherein the at
least one impedance element comprises a capacitance or an
inductance configured to pass a high frequency of the alternating
current voltage signal and generate a high frequency voltage
signal, and the pre-processed voltage signal is the high frequency
voltage signal.
5. The LED lighting assembly according to claim 1, wherein the
alternating current power inputted to the rectifying circuits
comprises alternating current power from the two sides of the LED
lighting assembly.
6. The LED lighting assembly according to claim 5, wherein the
switch control module and the rectifying circuits are connected to
two terminals of the at least one LED.
7. The LED lighting assembly according to claim 1, wherein the
alternating current power inputted to the rectifying circuits
comprises alternating current power from the switch control
module.
8. The LED lighting assembly according to claim 7, wherein the
rectifying circuits are connected between the switch control module
and the at least one LED.
9. An LED driving circuit configured to retrofit a fluorescent tube
lamp, comprising: a switch control module connected to at least one
LED and configured to receive and process an alternating current
voltage signal from two sides of a LED lighting assembly and
control to drive the at least one LED based on a processed voltage
signal; a first impedance element disposed between first and second
lamp pins on a first side of the LED lighting assembly; a second
impedance element disposed between third and fourth lamp pins on a
second side of the LED lighting assembly; a first rectifying
circuit connected to the at least one LED and configured to convert
a first alternating current power received from the first empedance
element into a first direct current power provided to the at least
one LED; and a second rectifying circuit connected to the at least
one LED and configured to convert a second alternating current
power received from the second impedance element into a second
direct current power provided to the at least one LED.
10. The LED driving circuit according to claim 9, wherein the
switch control module further comprises: a switch element having a
first threshold; and at least one integral element connected
between the switch element and at least one of the first impedance
element and the second impedance element, the at least one integral
element being configured to integrate the pre-processed voltage
signal and provide the processed voltage signal to the switch
element; wherein the switch element switches on and the control
switch module drives the at least one LED when the processed
voltage signal is larger than the first threshold.
Description
TECHNICAL FIELD
The present invention generally relates to the field of
illumination, and more particularly to an LED lighting assembly and
a driving circuit thereof.
BACKGROUND
Light-emitting diode (LED) light source has received extensive
attention and has been widely used due to its small size, low power
consumption and long service life. It has become a trend to replace
the traditional fluorescent lamp with LED tube.
With existing technology, replacing the traditional fluorescent
tube with the LED tube usually requires removal of the original
ballast. This method requires modification of the internal wiring
of the lamp, thus high labor costs are incurred. However, if the
original ballast is not removed, and if only the original
fluorescent tube is replaced by an LED tube, then at times the
ballast is incompatible and the LED tube cannot work as usual.
Therefore, in view of this, how to make it compatible with ballasts
when replacing fluorescent lamps is becoming more and more
urgent.
SUMMARY
One aspect of the present invention is to provide an LED lighting
assembly. The LED lighting assembly comprises at least one LED and
a driving circuit a driving circuit configured to drive the at
least one LED. The driving circuit comprises a switch control
module and a rectifying circuit. The driving circuit is connected
to the at least one LED and configured to receive and process an AC
voltage signal from one side or both sides of the LED lighting
assembly, and control the driving of the at least one LED based on
a processed voltage signal. The rectifying circuit is connected to
the at least one LED and configured to convert an AC power inputted
to the rectifying circuit into a DC power supplied to the at least
one LED.
Another aspect of the present invention is to provide an LED
driving circuit. The LED driving circuit comprises a switch control
module and a rectifying circuit. The driving circuit is connected
to the at least one LED and configured to receive and process an AC
voltage signal from one or both sides of the LED lighting assembly,
and control the driving of the at least one LED based on a
processed voltage signal. The rectifying circuit is connected to
the at least one LED and configured to convert an AC power inputted
to the rectifying circuit into a DC power supplied to the at least
one LED.
BRIEF DESCRIPTION OF DRAWINGS
These and other features, aspects and advantages of the present
invention will become better understood when the following detailed
description is read with reference to the accompanying drawings, in
which like reference numerals are used throughout the drawings to
refer to like parts, where:
FIG. 1 is a general schematic block diagram of an LED lighting
assembly according to the first and second embodiments of the
present invention;
FIG. 2 is a schematic circuit diagram of the LED lighting assembly
of the first embodiment of FIG. 1;
FIG. 3 is a schematic circuit diagram of a second embodiment of the
LED lighting assembly of FIG. 1;
FIG. 4 is a general schematic block diagram of an LED lighting
assembly according to a third embodiment of the present invention;
and
FIG. 5 is a schematic circuit diagram of the LED lighting assembly
of FIG. 4.
DETAILED DESCRIPTION OF EMBODIMENTS
The embodiments of the present invention will be described below in
detail with reference to the accompanying drawings in order to
facilitate those skilled in the art to exactly understand the
subject matter claimed by the present invention. In the following
detailed description of these specific embodiments, the present
specification does not describe in detail any of the known
functions or configurations, to avoid unnecessary details that may
affect the disclosure of the present invention.
Unless otherwise defined, the technical and scientific terms used
in the claims and the specification are as they are usually
understood by those skilled in the art to which the present
invention pertains. "First", "second" and similar words used in the
specification and the claims do not denote any order, quantity or
importance, but are merely intended to distinguish between
different constituents. The terms "one", "a" and similar words are
not meant to be limiting, but rather denote the presence of at
least one. "Comprising", "consisting of" and similar words mean
that the elements or articles appearing before "comprising" or
"consisting of" include the elements or articles and their
equivalent elements appearing behind "comprising" or "consisting
of", not excluding any other elements or articles. "Connected",
"coupled" and similar words are not restricted to physical or
mechanical connections, but may also include electrical
connections, whether direct or indirect. Further, terms indicating
a specific position, such as "top", "bottom", "left", "right", and
the like are merely descriptions made with reference to specific
drawings. Each embodiment disclosed herein may be placed in
different ways as illustrated in the drawings of the present
invention. Therefore, the positional terms used herein should not
be limited to the positions shown in the specific embodiments.
FIG. 1 shows a general schematic block diagram of an LED lighting
assembly 100/200 according to the first and second embodiments of
the present invention, and FIG. 2 shows a schematic circuit diagram
of the LED lighting assembly 100 of the first embodiment of FIG. 1.
Referring to FIGS. 1-2, the LED lighting assembly comprises at
least one LED 120 and a driving circuit 110, wherein the driving
circuit 110 comprises a switch control module 111 and a rectifying
circuit 112.
The LED lighting assembly 100 further comprises lamp pins 101 and
102 on one side of the lighting assembly 100, and a first impedance
element 105 connected between the lamp pins 101 and 102; and lamp
pins 103 and 104 on the other side of the lighting assembly 100,
and a second impedance element 106 connected between the lamp pins
103 and 104, wherein the first impedance element 105 and the second
impedance element 106 are used to simulate the filament of the
fluorescent tube. The ballast 130 is connected to one of the lamp
pins.
The switch control module 111 is connected between the lamp pins on
both sides of the lighting assembly 100 for receiving and
processing voltage signals, and controls the operation of driving
the at least one LED based on the processed voltage signals.
Preferably, the switch control module 111 is connected between the
first impedance element 105 and the second impedance element 106
for receiving and processing the voltage signals. The switch
control module 111 further comprises a third impedance element 131,
an integral element 132, and a switch element 133. The third
impedance element 131 has one end connected to the first impedance
element 105 and the other end connected to the P.sub.1 terminal of
the switch element 133. One end of the integral element 132 is
connected to the P.sub.1 terminal of the switch element 133, and
the other end is connected to the P.sub.2 terminal of the switch
element 133. The P.sub.2 terminal of the switch element 133 is
connected to the second impedance element 106, and the P.sub.3
terminal of the switch element 133 is connected to the negative
terminal of the LED 120. In another embodiment, the switch element
133 can also be coupled to the positive terminal of the LED 120,
and the rectifying circuit 112 can be coupled to the negative
terminal of the LED 120. In one embodiment, the switch element 133
can be any one of a Silicon Controlled Rectifier (SCR), a relay, a
thyristor, a field effect transistor, or a conventional switch. The
third impedance element 131 can receive the voltage signal and
generate a pre-processed voltage signal. The integral element 132
can integrate the pre-processed voltage signal and supply a
processed voltage signal to the switch element 133. The switch
element 133 has a first threshold; when the processed voltage
signal supplied by the integral element 132 is greater than the
first threshold of the switch element, the switch element 133 is
turned on, the path of the LED 120 is closed, and the LED 120
operates.
In one embodiment, the third impedance element 131 is a resistor
that can step down the voltage signal and generate a step-down
signal, and the step-down signal is a pre-processed voltage signal.
In another embodiment, the third impedance element 131 is a
capacitor or an inductor, and the capacitor or the inductor can
perform a frequency operation on the voltage signal, pass the high
frequency portion of the voltage signal, and generate a high
frequency voltage signal, whereby the high frequency voltage signal
is a pre-processed voltage signal.
In an alternative embodiment, the switch control module 111 further
comprises a Zener diode 134, having a cathode connected to the
third impedance element 131 and an anode connected to the P.sub.1
terminal of the switch element 133. The Zener diode 134 comprises a
second threshold; when the pre-processed voltage signal generated
by the third impedance element 131 is greater than the second
threshold, the Zener diode has a reverse breakdown, and the
integral element 132 begins to integrate the pre-processed voltage
signal and supplies the processed voltage signal to the switch
element 133. In one embodiment, the second threshold is the
breakdown voltage of the Zener diode 134. The Zener diode 134 acts
as protection for the circuit to prevent a suddenly increasing
voltage signal from damaging the circuit.
The rectifying circuit 112 is coupled to the LED 120 to convert the
AC from the first impedance element 105 and the second impedance
element 106 on both sides of the LED lighting assembly 100 to the
DC that is supplied to the LED 120. The rectifying circuit 112
comprises four diodes: D.sub.1, D.sub.2, D.sub.3, and D.sub.4.
Whereby the junction between the anode of the diode D.sub.1 and the
cathode of the diode D.sub.2 is connected to the first impedance
element 105; the junction between the anode of the diode D.sub.3
and the cathode of the diode D.sub.4 is connected to the second
impedance element 106; the cathode of the diode D.sub.1 and the
cathode of the diode D.sub.3 are connected to the positive terminal
of the LED 120; the anode of diode D.sub.2 and the anode of the
diode D.sub.4 are connected to ground. Alternatively, the junction
between the anode D.sub.1 and the cathode of the diode D.sub.2 is
connected to the first impedance element 105 through a fuse, while
the junction between the anode of the diode D.sub.3 and the cathode
of the diode D.sub.4 is connected to the second impedance element
106 through a fuse.
FIG. 3 is a schematic diagram showing the circuit structure of the
LED lighting assembly 200 of the second embodiment of FIG. 1.
Referring to FIG. 1 and FIG. 3, based on the LED lighting assembly
100 shown in FIG. 2, unlike the first embodiment, the switch
control module 211 of the LED lighting assembly 200 of the second
embodiment is connected to the side of the lamp tube between the
two lamp pins, for receiving and processing the voltage signal, and
controlling the driving of the LED 120 based on the processed
voltage signal. Preferably, the switch control module 211 is
coupled between the lamp pins 101 and 102, i.e., at both ends of
the first impedance element 105, for receiving and processing the
filament voltage signal. The switch control module 211 further
comprises a fourth impedance element 235, wherein the P.sub.2
terminal of the switch element 133 is connected to the lamp pin 102
through the fourth impedance element 235, and one end of the third
impedance element 131 is connected to the lamp pin 101.
FIG. 4 shows a general schematic block diagram of an LED lighting
assembly 300 according to a third embodiment of the present
invention, and FIG. 5 shows a circuit configuration diagram of the
LED lighting assembly 300 of FIG. 4. Referring to FIGS. 4-5, based
on the LED lighting assembly 100 shown in FIG. 1, unlike the first
embodiment, the rectifying circuit 312 in the driving circuit 310
of the LED lighting assembly 300 of the third embodiment is
connected between the switch control module 311 and the LED 120,
the AC from the switch control module 311 is converted into DC and
supplied to the LED 120, while the connection of the switch control
module 311 in the LED lighting assembly 300 is different from the
connection of the lighting assembly 100.
The rectifying circuit 312 comprises four diodes: D.sub.5, D.sub.6,
D.sub.7, and D.sub.8. Wherein the junction between the anode of the
diode D.sub.5 and the cathode of the diode D.sub.6 is connected to
the switch element 333 of the switch control module 311; the
junction between the anode of the diode D.sub.7 and the cathode of
the diode D.sub.8 is connected to the second impedance element 106;
the cathode of the diode D.sub.5 and the cathode of the diode
D.sub.7 are connected to the positive terminal of the LED 120; the
anode of the diode D.sub.6 and the anode of the diode D.sub.8 are
connected to the negative terminal of the LED 120.
The switch control module 311 comprises a third impedance element
131, an integral element 132, and a switch element 333. The third
impedance element 131 has one end connected to the first impedance
element 105 and the other end connected to the P.sub.4 terminal of
the switch element 333. One end of the integral element 132 is
connected to the P.sub.4 terminal of the switch element 333, and
the other end is connected to the second impedance element 106. The
P.sub.5 terminal of the switch element 333 is connected to the
first impedance element 105, and the P.sub.6 terminal is connected
to the input terminal of the rectifying circuit 312. In one
embodiment, switch element 333 comprises a bidirectional diode.
The LED lighting assembly 100/200/300 and the driving circuit
thereof provided by the present invention can eliminate the need to
remove the ballast when replacing the fluorescent tube, save cost,
and are effectively compatible with the ballast, such that the LED
may work as usual.
While the present invention has been described in detail with
reference to specific embodiments thereof, it will be understood by
those skilled in the art that many modifications and variations can
be made in the present invention. It is, therefore, to be
understood that the appended claims are intended to cover all such
modifications and variations insofar as they are within the true
spirit and scope of the invention.
* * * * *